Fixed serialization of t-distance

Change-Id: I411054200c13fa930e1cee795fb8e10e29f1a20e
diff --git a/pom.xml b/pom.xml
index 60dd27b..4b2b844 100644
--- a/pom.xml
+++ b/pom.xml
@@ -25,7 +25,7 @@
 
   <groupId>de.ids_mannheim.korap</groupId>
   <artifactId>Krill</artifactId>
-  <version>0.55.5</version>
+  <version>0.55.6</version>
   <packaging>jar</packaging>
 
   <name>Krill</name>